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Mon, 7 May 2018 21:14:12 -0400 Reply-To: prakash.sangappa@oracle.com Subject: Re: [RFC PATCH] Add /proc//numa_vamaps for numa node information References: <1525240686-13335-1-git-send-email-prakash.sangappa@oracle.com> <20180502143323.1c723ccb509c3497050a2e0a@linux-foundation.org> <2ce01d91-5fba-b1b7-2956-c8cc1853536d@intel.com> <33f96879-351f-674a-ca23-43f233f4eb1d@linux.vnet.ibm.com> <82d2b35c-272a-ad02-692f-2c109aacdfb6@oracle.com> <8569dabb-4930-aa20-6249-72457e2df51e@intel.com> <51145ccb-fc0d-0281-9757-fb8a5112ec24@oracle.com> To: Dave Hansen , Anshuman Khandual , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, mhocko@suse.com, kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com, drepper@gmail.com, rientjes@google.com, Naoya Horiguchi From: "prakash.sangappa" Message-ID: Date: Mon, 7 May 2018 18:16:13 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8886 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=776 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1805080009 Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 05/07/2018 05:05 PM, Dave Hansen wrote: > On 05/07/2018 04:22 PM, prakash.sangappa wrote: >> However, with the proposed new file, we could allow seeking to >> specified virtual address. The lseek offset in this case would >> represent the virtual address of the process. Subsequent read from >> the file would provide VA range to numa node information starting >> from that VA. In case the VA seek'ed to is invalid, it will start >> from the next valid mapped VA of the process. The implementation >> would not be based on seq_file. > So you're proposing a new /proc/ file that appears next to and is > named very similarly to the exiting /proc/, but which has entirely > different behavior? It will be /proc//numa_vamaps. Yes, the behavior will be different with respect to seeking. Output will still be text and the format will be same. I want to get feedback on this approach.